Android-BiometricManager 指紋登入

主要物件：

BiometricManager

-檢查使用者是否有指紋辨識or是否設置密碼

BiometricPrompt

-初始化指紋視窗 並且 呼叫指紋視窗

BiometricPromptInfo

-指紋視窗的一些設定 Title , Description ...

Coding:

這邊會先建議建立 BiometricManager

主要是因為,他能判斷使用者是否有支持指紋或者設置Pin碼

• BIOMETRIC_ERROR_NO_HARDWARE：沒有指紋
• BIOMETRIC_ERROR_HW_UNAVAILABLE：沒有獲取到硬體
• BIOMETRIC_ERROR_NONE_ENROLLED：沒有設定生物辨識

val biometricManager = BiometricManager.from(this) 

when (biometricManager.canAuthenticate()) {     

BiometricManager.BIOMETRIC_SUCCESS ->         

  Log.d("TAG", "App can authenticate using biometrics.")     

BiometricManager.BIOMETRIC_ERROR_NO_HARDWARE ->        

   Log.e("TAG", "No biometric features available on this device.") 

BiometricManager.BIOMETRIC_ERROR_HW_UNAVAILABLE ->         

   Log.e("TAG", "Biometric features are currently unavailable.") 

BiometricManager.BIOMETRIC_ERROR_NONE_ENROLLED ->        

   Log.e("TAG", "The user hasn't associated any biometric credentials with their account.") 

}

建立 executors and callback(BiometricPrompt.AuthenticationCallback)

val executors = ContextCompat.getMainExecutor(this)

val callback = object : BiometricPrompt.AuthenticationCallback(){

    override fun onAuthenticationError(errorCode: Int, errString: CharSequence) {

        super.onAuthenticationError(errorCode, errString)

    }



    override fun onAuthenticationSucceeded(result: BiometricPrompt.AuthenticationResult) {

        super.onAuthenticationSucceeded(result)

        finish()

        startActivity(Intent(this@LoginActivity,MainActivity::class.java))

    }



    override fun onAuthenticationFailed() {

        super.onAuthenticationFailed()

    }

}

再來 建立 BiometricPromptInfo

val biometricPromptInfo = BiometricPrompt.PromptInfo.Builder()

        .setTitle("Authentication")

        .setDescription("")

        .setDeviceCredentialAllowed(true)

        .build()

最後 BiometricPrompt

biometricPrompt.authenticate -呼叫指紋

biometricPrompt = BiometricPrompt(this, executors, callback) 

biometricPrompt.authenticate(biometricPromptInfo)

結果：

GitHub: